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Direct formation of metal nanoparticles using ultrasound

United States Patent

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December 31, 2019
View the Complete Patent at the US Patent & Trademark Office
A method for creating nanoparticles directly from bulk metal by applying ultrasound to the surface in the presence of a two-part surfactant system. Implosive collapse of cavitation bubbles near the bulk metal surface generates powerful microjets, leading to material ejection. This liberated material is captured and stabilized by a surfactant bilayer in the form of nanoparticles. Nanoparticles can be produced regardless of the bulk metal form factor. The method is generally applicable of metals and alloys. The method can be applied to an environmentally important problem, the reclamation of gold from an electronic waste stream.
16/ 219,482
December 13, 2018
B22F 9/04 (20060101)B22F 9/16 (20060101)B22F 1/00 (20060101)B22F 9/20 (20060101)B82Y 40/00 (20110101)B82Y 30/00 (20110101)B22F 9/00 (20060101)
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention.